不同连接形式的装配式混凝土梁柱节点受力性能试验研究

Experimental study on the mechanical performance of prefabricated concrete beam-column joints with different connection forms

为研究不同连接形式的装配式混凝土梁柱节点受力性能,对1个现浇混凝土节点和2个装配式混凝土梁柱节点试件进行循环往复加载试验,分析节点的破坏特征、梁端弯矩—转角、节点核心区剪力—梁端转角、刚度退化、钢板的应变等。结果表明:方钢管连接的装配式混凝土节点呈梁端弯曲破坏,设置端板和水平连接板的装配式节点和现浇节点呈节点核心区剪切破坏。装配式节点的梁端弯矩和节点剪力显著提高,梁端转角显著增加,节点核心区剪切变形减小,刚度退化变缓,受力性能得到明显改善。在节点核心区设置方钢管和十字隔板作为钢骨架的节点受力性能最佳,远优于现浇节点。在节点核心区加入钢连接件,预制梁端设置预埋工字钢,现场采用焊接或者栓接装配,后浇连接区混凝土,这种连接形式能够有效传力,提升装配式节点的受力性能。

To study the mechanical performance of prefabricated concrete beam-column joints with different connection forms,the cyclic loading test for one monolithic concrete joint and two prefabricated concrete beamcolumn joints were conducted to evaluate the damage characteristics,beam end’s moment-rotation,joint core shear force-beam end’s rotation,stiffness degradation and strain of steel plates.The results show that the prefabricated concrete joint with square steel tube experienced flexural damage,and the prefabricated joint with end plates and horizontal connection plates and monolithic joint presented shear damage at the joint core.The bending moment and shear force of prefabricated joints significantly increased,while shear deformation in the core area decreased,stiffness degradation constrained,and the rotation in the beam end significantly enhanced,thus the mechanical performance significantly improved.The joint with square steel tube and orthogonal steel plate had the best mechanical performance,which was much better than that of the monolithic joint.The connection forms in which steel connectors were added to the joint core region,H-steel was set in the beam end,welded or bolted connection were used on site,and post-casting concrete was poured in the connection area could effectively transfer force and improve the mechanical performance.